The 64' Impala got its name from the flat sweep geometry of six degrees back and four degrees up. This bar is 13 butted and heat treated 4130 chromoly, the crossbar is 16mm and they're available in 6 sizes in black and chrome.
Six degrees back, four degrees up, 11 butted and heat treated 4130 chromoly, 16mm cross-bar, black or chrome. 7.5", 8" or 8.5" rise is how we roll in our six four.
7.5" rise - 27" wide
8" rise - 27" wide
8.5" rise - 29" wide
25 ounces.